{"id":"CVE-2026-99284","revision":"085eda21fbec4b8fab13efd74eea2bc5","records":[{"revision":"085eda21fbec4b8fab13efd74eea2bc5","observedAt":"2026-11-07T21:52:05.627+00:00","statement":{"source":"cve-program","id":"CVE-2026-99284","aliases":[],"title":"net: skbuff: propagate shared-frag marker in skb_zerocopy()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: propagate shared-frag marker in skb_zerocopy()\n\nskb_zerocopy() moves frag descriptors from @from into @to and takes a\nreference on each frag, but it does not copy skb_shinfo(from)->flags into\nskb_shinfo(to)->flags.  A destination skb holding the same page-cache\nbacked frags as the source therefore reports skb_has_shared_frag() as\nfalse.\n\nThat breaks the invariant relied on by later in-place writers.  ESP input\nchecks skb_has_shared_frag() before deciding whether an uncloned\nnonlinear skb can skip skb_cow_data(); with the marker lost, an skb that\nskb_zerocopy() built for nfnetlink_queue or for an openvswitch upcall is\ndecrypted in place, letting an unprivileged user write into the page\ncache of a root-owned read-only file.\n\nPropagate SKBFL_SHARED_FRAG when frag descriptors are copied, as done for\nthe other frag-transfer helpers.","state":0,"publishedAt":"2026-11-07T20:40:33.661+00:00","modifiedAt":"2026-11-07T20:40:33.661+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/core/skbuff.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"af2806f8f90a150160be898cd85332459c83c5cb\",\n                            \"lessThan\": \"1c623e3cbf43f12dd4a72712079bfa247a9b8ba3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"af2806f8f90a150160be898cd85332459c83c5cb\",\n                            \"lessThan\": \"d7d6ff98d5d1b400f02211f962ac32cc0020aeab\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"af2806f8f90a150160be898cd85332459c83c5cb\",\n                            \"lessThan\": \"1a9c180cd8435917b7516edfb1c9148032c28773\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"af2806f8f90a150160be898cd85332459c83c5cb\",\n                            \"lessThan\": \"79dc34beb1fdb3da79753e51e15c68591a2561fe\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/core/skbuff.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.14\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.14\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.61\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.15\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3.2\",\n                            \"lessThanOrEqual\": \"7.3.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.4-rc1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/1c623e3cbf43f12dd4a72712079bfa247a9b8ba3","https://git.kernel.org/stable/c/d7d6ff98d5d1b400f02211f962ac32cc0020aeab","https://git.kernel.org/stable/c/1a9c180cd8435917b7516edfb1c9148032c28773","https://git.kernel.org/stable/c/79dc34beb1fdb3da79753e51e15c68591a2561fe"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99284","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-99284","identifiers":["CVE-2026-99284"]},"retained":false,"historicalAffected":[]}],"coverage":[]}